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Sistrurus miliarius (Linnaeus, 1766) - Western Pygmy Rattlesnake

Collection Summary

Sistrurus miliarius (Western Pygmy Rattlesnake) has a total of 131 valid, non-duplicated collections representing 16 counties and 82 localities. There are a total of 58 collectors and 76 collection dates for the species. This results in a total of 84 expeditions for the species, a measure of unique date / collector(s) combinations. The earliest collection year for the species in Missouri is 1900 and its most recent collection year is 2025. The earliest and latest collection dates (independent of earliest and most recent collection years) are April 1 and October 20, respectively. If you have a new record to report, read the New Records section of the FAQ.

Collection Summary by County

Collection summary for Sistrurus miliarius (Western Pygmy Rattlesnake) by county. Some values are unavailable since some records are represented solely by historical literature reports, which sometimes lack complete collecting data. Click on a county name to view more information about that county. Click on column headings to sort by that column.
County Localities Collections Collectors Dates Expeditions Earliest Year Latest Year
Barry 3 5 5 5 5 1939 2014
Butler 2 2 1 2 2 1960 1962
Carter 2 9 4 3 4 1940 2008
Christian 7 11 12 7 7 1967 2024
Douglas 2 2 3 2 2 2008 2008
Howell 3 3 4 2 3 1938 1969
McDonald 1 1 1 1 1 2011 2011
Oregon 3 3 2 3 3 1900 1961
Ozark 11 19 10 11 11 1956 1998
Reynolds 2 3 3 3 3 1933 1938
Ripley 3 3 5 3 3 2008 2009
Shannon 9 11 11 10 10 1939 2017
Stone 4 10 3 6 6 1907 1931
Taney 14 19 12 14 15 1954 2025
Washington 2 2 2 2 2 1951 1951
Wayne 13 27 10 15 17 1933 2019